A refining furnace blowing gun and installation structure

Abstract

The present application discloses a refining furnace spray gun and its installation structure. The refining furnace spray gun includes a central tube, a sleeve is arranged outside the central tube, and a refractory material is wrapped outside the sleeve to form a refractory sleeve. The refining furnace spray gun of the present application is installed on a rotatable and lifting mechanical structure, and the installation position is on the side of the top of the furnace body, so that the gun body is inserted into the ladle at a certain angle for refining. The refining furnace spray gun of the present invention can spray a variety of media, such as lime + oxygen or oxygen + carbon dioxide / argon, so as to achieve dephosphorization and decarburization during the refining process of molten steel. The gun body is installed on the top side of the refining furnace through a rotating and lifting mechanism, which can realize the rotation, lifting and other actions of the overall equipment, so as to facilitate the refining of molten steel. The present invention has an ingenious and compact structure, a small size, a wide applicability, strong practicality, and broad prospects for industrial application.

Description

Technical Field

[0001] The present application relates to the technical field of steel smelting, and in particular to a refining furnace blowing gun and a mounting structure. Background Art

[0002] The oxygen blowing device of the refining furnace is a device that blows oxygen, argon or nitrogen into the molten metal pool in the refining furnace and cools the oxygen lance through the argon or nitrogen sleeve outside the oxygen lance. In the process of molten steel refining, the oxygen blowing device is used as an auxiliary refining equipment. On the one hand, the oxygen and argon gas blown in dilute CO / CO2 and reduce its partial pressure, thereby achieving the effect of decarburization; on the other hand, due to the blowing of high-pressure argon-oxygen mixed gas, the contact opportunity between molten steel and bubbles and steel slag is increased, which is convenient for rapid decarburization and helps to quickly desulfurize, degas and remove non-metallic inclusions.

[0003] The existing refining furnace oxygen blowing devices include AOD furnace oxygen blowing lances and VOD furnace oxygen lances. The AOD furnace oxygen blowing lance is installed on the bottom side wall of the refining furnace. When the refining furnace is tilted, it is above the molten steel liquid level. After the refining furnace is straightened, the entire device is submerged below the molten steel liquid level. Due to the long-term immersion and flushing of the molten steel, the overall life of the device is short, which increases the cost and on-site work intensity during use; the VOD furnace oxygen lance is a top lance, and the installation process has the problem of large equipment size and large space occupation; and the LF ladle refining furnace is not equipped with an oxygen blowing lance. Therefore, the current refining furnace oxygen blowing process and oxygen blowing device have certain room for improvement. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a refining furnace blowing gun and an installation structure.

[0005] In a first aspect, the present invention provides a refining furnace blowing gun, which is realized by adopting the following technical solution.

[0006] A refining furnace blowing gun comprises a gun body, wherein the gun body comprises a central tube, a sleeve is arranged outside the central tube, and a refractory sleeve is arranged outside the sleeve.

[0007] Furthermore, a mounting sleeve is provided at the rear of the refractory sleeve.

[0008] In a second aspect, the present invention provides a use of a refining furnace blowing gun, which is achieved by adopting the following technical solution.

[0009] The above-mentioned refining furnace blowing gun is used for dephosphorization and decarburization in the process of molten steel refining or for blowing oxygen in the process of molten steel primary refining.

[0010] In a third aspect, the present invention provides an installation structure for a refining furnace blowing gun, which is achieved by adopting the following technical solution.

[0011] The above-mentioned installation structure of the refining furnace blowing gun includes a mounting seat, the upper part of the mounting seat is rotatably connected to the mounting arm, the front part of the mounting arm is inclinedly provided with a gun body mounting frame, the gun body is movably mounted on the gun body mounting frame, and the gun body moves up and down along the gun body mounting frame.

[0012] Furthermore, a rotating shaft is provided on the upper end surface of the mounting seat, and one end of the mounting arm away from the gun body is sleeved on the rotating shaft; a rotating hydraulic cylinder is also installed on the mounting seat, and the output end of the rotating hydraulic cylinder is connected to the mounting arm.

[0013] Furthermore, the front middle portion of the mounting arm is obliquely connected to the support plate, and the upper end of the support plate is connected to the back side of the gun body mounting bracket.

[0014] Furthermore, a motor is connected to the upper part of the gun body mounting frame, a driving gear is sleeved on the output end of the motor, and the driving gear is connected to a driven gear installed at the lower part of the gun body mounting frame through a transmission chain; a gun body mounting seat is fixed on the transmission chain, and a clamping mechanism of the gun body is provided on the gun body mounting seat.

[0015] Furthermore, a fixing block is provided inside the gun body mounting seat, and the fixing block is fixed on the transmission chain; guide wheels are connected to both sides of the gun body mounting seat, and the guide wheels are embedded in the slide grooves provided on both sides of the gun body mounting frame and slide along the slide grooves.

[0016] Furthermore, the clamping mechanism comprises a clamp fixing seat fixed on one side of the gun body mounting seat, and a gun body clamp is provided on the clamp fixing seat.

[0017] Furthermore, the gun body clamp includes a fixed portion fixed on the clamp fixing seat, and a movable portion hinged to the fixed portion, and the free ends of the fixed portion and the movable portion are connected by a locking piece.

[0018] This application has the following beneficial effects.

[0019] The present invention can change the position of the medium sprayed into the refining furnace through the rotating lifting structure, the adjustment process is convenient, the practicability is strong, and the gun body can spray a variety of media, such as lime + oxygen or oxygen + carbon dioxide / argon, so as to realize the dephosphorization and decarburization process in the molten steel refining process. When the gun body is used to blow oxygen, the immersion and flushing time of the oxygen blowing gun in the molten steel can be reduced, the working time of the oxygen blowing gun can be visualized and controllable, and the working life of the oxygen blowing device can be increased; for the LF ladle refining furnace, a platform can be added to the side of the furnace top to install the device to complete the refining tasks such as decarburization and degassing of the molten steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the gun body of the present invention;

[0021] Figure 2 is a cross-sectional view of the gun body of the present invention;

[0022] Figure 3 is a side view of the gun body and the mounting structure of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the gun body and the mounting structure of the present invention;

[0024] Figure 5 It is a schematic diagram intended to embody the gun body mounting seat structure of the present invention.

[0025] Among them, 1. gun body; 2. center tube; 3. center tube inlet; 4. casing; 5. casing inlet; 6. refractory sleeve; 7. mounting sleeve; 8. mounting seat; 9. mounting arm; 10. support plate; 11. hydraulic cylinder mounting frame; 12. connecting piece; 13. rotating hydraulic cylinder; 14. rotating shaft; 15. gun body mounting frame; 16. motor; 17. driving gear; 18. transmission chain; 19. driven gear; 20. gun body mounting seat; 21. guide wheel; 22. slide groove; 23. fixing block; 24. clamp fixing seat; 25. gun body clamp; 251. fixing part; 252. movable part; 253. locking piece; 26. furnace cover. DETAILED DESCRIPTION

[0026] The present patent application is further described below in conjunction with embodiments.

[0027] A refining furnace blowing gun comprises a gun body 1, the gun body 1 comprises a central tube 2, the rear end of the central tube 2 is bent to form a central tube inlet 3; a sleeve 4 is arranged outside the central tube 2, the rear end of the sleeve 4 is connected to an elbow, and the end of the elbow forms a sleeve inlet 5. A circle of refractory material is wrapped around the gun barrel outside the sleeve 4 to form a refractory sleeve 6, and a mounting sleeve 7 is arranged at the rear of the refractory sleeve 6, and the mounting sleeve 7 is used to connect with the mounting structure of the blowing gun.

[0028] The central tube 2 and the sleeve 4 of the present invention can realize different treatment processes by changing the medium blown in. The gas blown into the sleeve 4 includes but is not limited to argon, carbon dioxide, oxygen, etc.; the substances blown into the central tube 2 include but are not limited to oxygen, lime, methane, etc. When lime + oxygen is blown into the gun body, the dephosphorization process can be realized; when oxygen + carbon dioxide / argon is blown into the gun body, the decarburization process can be realized. In addition, the gun body of the present invention can also be used in the primary refining furnace to replace the furnace door oxygen gun.

[0029] The present invention also provides a mounting structure for the above-mentioned refining furnace blowing gun, which is installed obliquely above the ladle so that the gun body can be inserted into the ladle at a certain angle for refining, and the mounting structure can realize the rotation and lifting of the gun body.

[0030] Specifically, a mounting structure of a refining furnace blowing gun includes a mounting seat 8, a rotating shaft 14 is provided on the upper end surface of the mounting seat 8, and an end of a mounting arm 9 away from a gun body 1 is sleeved on the rotating shaft 14 and can rotate around the rotating shaft 14. A hydraulic cylinder mounting frame 11 is connected to the side wall of the mounting seat 8, a rotating hydraulic cylinder 13 is installed on the hydraulic cylinder mounting frame 11, a connecting piece 12 is connected to the lower surface of the mounting arm 9, and an output end of the rotating hydraulic cylinder 13 is connected to the connecting piece 12, and the rotating hydraulic cylinder 13 can provide power for the rotation of the mounting arm 9, thereby realizing the rotation function of the entire device.

[0031] The middle front part of the mounting arm 9 is connected to the support plate 10 at an angle, and the upper end of the support plate 10 is connected to the middle part of the back of the gun body mounting frame 15. The middle part of the gun body mounting frame 15 of the present application is fixed on the support plate 10, and the front end of the gun body mounting frame 15 overlaps the front end of the mounting arm 9, so that the entire gun body mounting frame 15 is arranged obliquely above the furnace cover 26.

[0032] The upper part of the gun body mounting frame 15 is connected to a motor 16, and a driving gear 17 is sleeved on the output end of the motor 16. The driving gear 17 is connected to a driven gear 19 installed at the lower part of the gun body mounting frame 15 through a transmission chain 18. A gun body mounting seat 20 is fixed on the transmission chain 18. Specifically, the gun body mounting seat 20 is a frame structure composed of two side plates and a top plate. The gun body mounting frame 15 is placed in the frame structure. A fixing block 23 is also provided in the frame structure. Both sides of the fixing block 23 are fixed to the two side plates, and the middle part of the fixing block 23 is fixed to the transmission chain 18. In addition, the upper and lower ends of the two side plates of the frame structure are connected to guide wheels 21, and the guide wheels 21 are embedded in the slide grooves 22 set on both sides of the gun body mounting frame 15 and can slide along the slide grooves 22. When the motor 16 rotates forward, the driving gear 17 is driven to rotate, and the driving gear 17 drives the driven gear 19 to rotate through the transmission chain 18. At the same time, the gun body mounting seat 20 installed on the transmission chain 18 moves downward under the drive of the transmission chain 18, and the guide wheel 21 slides downward along the slide groove 22 and stops after reaching a certain height; when the height of the gun body needs to be raised, the motor 16 can be reversed, and the gun body can move upward along the gun body mounting frame 15. The lifting function of the gun body can be realized through this structure.

[0033] The gun body mounting seat 20 of the present application is provided with a clamping mechanism of the gun body 1, and the clamping mechanism can adopt a variety of structures, as long as it can achieve the clamping of the gun body 1. The present application provides the following preferred structure, which is as follows: a clamp fixing seat 24 is provided on one side of the top plate of the gun body mounting seat 20, and a gun body clamp 25 is provided on the clamp fixing seat 24. The gun body clamp 25 includes a fixed portion 251 fixed on the clamp fixing seat 24, and a movable portion 252 hinged to the fixed portion 251, and the free ends of the fixed portion 251 and the movable portion 252 are connected by a locking member 253. When the gun body is installed, the locking member 253 is opened, and a part of the gun body mounting sleeve 7 is placed on the fixed portion 251, and then the fixed portion 251 and the movable portion 252 are buckled and locked to lock the locking member 253, so as to achieve simple installation of the gun body 1.

[0034] By adopting the structure of the present invention, when it is necessary to refine the molten steel in the refining furnace, the rotating mechanism rotates into position in the direction of the furnace, and the lifting structure is lowered until the gun body reaches the specified position. The gun body goes deep into the refining furnace at a certain angle to start refining. The above overall process can be completed by PLC operation with personnel assistance. This application effectively solves the problem of short service life caused by the oxygen lance in the AOD furnace being below the molten steel liquid level for a long time; it also solves the problem of large space occupied by the oxygen lance on the top of the VOD furnace; and at the same time provides a feasible solution for setting up an oxygen lance for the LF ladle refining furnace.

[0035] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A refining furnace blowing gun, comprising a gun body (1), characterized in that: The gun body (1) comprises a central tube (2), a sleeve (4) is arranged outside the central tube (2), and a refractory sleeve (6) is arranged outside the sleeve (4).

2. A refining furnace blowing gun according to claim 1, characterized in that: The rear portion of the fire-resistant sleeve (6) is provided with a mounting sleeve (7).

3. Use of the refining furnace blowing gun according to claim 1 or 2 in dephosphorization and decarburization during molten steel refining or oxygen blowing during primary steel refining.

4. A mounting structure for a refining furnace blowing gun according to claim 1 or 2, characterized in that: The invention comprises a mounting seat (8), the upper part of which is rotatably connected to a mounting arm (9), the front part of which is obliquely provided with a gun body mounting frame (15), the gun body (1) being movably mounted on the gun body mounting frame (15), and the gun body (1) being movable up and down along the gun body mounting frame (15).

5. The installation structure of the refining furnace blowing gun according to claim 4 is characterized in that: A rotating shaft (14) is provided on the upper end surface of the mounting seat (8), and one end of the mounting arm (9) away from the gun body (1) is sleeved on the rotating shaft (14); a rotating hydraulic cylinder (13) is also installed on the mounting seat (8), and the output end of the rotating hydraulic cylinder (13) is connected to the mounting arm (9).

6. The installation structure of a refining furnace blowing gun according to claim 4, characterized in that: The middle front portion of the mounting arm (9) is obliquely connected to the support plate (10), and the upper end of the support plate (10) is connected to the back side of the gun body mounting frame (15).

7. The installation structure of a refining furnace blowing gun according to claim 4, characterized in that: The upper part of the gun body mounting frame (15) is connected to a motor (16), the output end of the motor (16) is sleeved with a driving gear (17), the driving gear (17) is connected to a driven gear (19) mounted on the lower part of the gun body mounting frame (15) through a transmission chain (18); a gun body mounting seat (20) is fixed on the transmission chain (18), and a clamping mechanism of the gun body (1) is provided on the gun body mounting seat (20).

8. The installation structure of the refining furnace blowing gun according to claim 7 is characterized in that: A fixing block (23) is provided inside the gun body mounting seat (20), and the fixing block (23) is fixed on the transmission chain (18); guide wheels (21) are connected to both sides of the gun body mounting seat (20), and the guide wheels (21) are embedded in the sliding grooves (22) provided on both sides of the gun body mounting frame (15) and slide along the sliding grooves (22).

9. The installation structure of a refining furnace blowing gun according to claim 7, characterized in that: The clamping mechanism comprises a clamp fixing seat (24) fixed on one side of the gun body mounting seat (20), and a gun body clamp (25) is arranged on the clamp fixing seat (24).

10. The installation structure of the blowing gun of a refining furnace according to claim 9, characterized in that: The gun body clamp (25) comprises a fixed portion (251) fixed on a clamp fixing seat (24), and a movable portion (252) hinged to the fixed portion (251), and the free ends of the fixed portion (251) and the movable portion (252) are connected via a locking member (253).

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